[INFO] fetching crate xpq 0.2.1...
[INFO] documenting xpq-0.2.1 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate xpq 0.2.1 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate xpq 0.2.1 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-7/source/rust-toolchain
[INFO] started tweaking crates.io crate xpq 0.2.1
[INFO] finished tweaking crates.io crate xpq 0.2.1
[INFO] tweaked toml for crates.io crate xpq 0.2.1 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate xpq 0.2.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded flatbuffers v0.6.1
[INFO] [stderr]   Downloaded parquet v1.0.1
[INFO] [stderr]   Downloaded arrow v1.0.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 96459f18a756e8749a90ee1b8cd88509b68fdc7f60fc6ae0f6e6af17d980b1b7
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "96459f18a756e8749a90ee1b8cd88509b68fdc7f60fc6ae0f6e6af17d980b1b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "96459f18a756e8749a90ee1b8cd88509b68fdc7f60fc6ae0f6e6af17d980b1b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "96459f18a756e8749a90ee1b8cd88509b68fdc7f60fc6ae0f6e6af17d980b1b7", kill_on_drop: false }`
[INFO] [stdout] 96459f18a756e8749a90ee1b8cd88509b68fdc7f60fc6ae0f6e6af17d980b1b7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 91d43c7b479c581789da8b281eadde5538cade182508c281a13318a47c326725
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "91d43c7b479c581789da8b281eadde5538cade182508c281a13318a47c326725", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]     Checking alloc-no-stdlib v2.0.1
[INFO] [stderr]    Compiling snap v1.0.1
[INFO] [stderr]     Checking integer-encoding v1.1.5
[INFO] [stderr]    Compiling parquet v1.0.1
[INFO] [stderr]    Compiling num-bigint v0.3.0
[INFO] [stderr]    Compiling num-rational v0.3.1
[INFO] [stderr]     Checking flatbuffers v0.6.1
[INFO] [stderr]     Checking tabwriter v1.2.1
[INFO] [stderr]     Checking aho-corasick v0.7.14
[INFO] [stderr]    Compiling cc v1.0.61
[INFO] [stderr]     Checking ordered-float v1.1.0
[INFO] [stderr]     Checking streaming-stats v0.2.3
[INFO] [stderr]     Checking threadpool v1.8.1
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking flate2 v1.0.18
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking alloc-stdlib v0.2.1
[INFO] [stderr]     Checking thrift v0.13.0
[INFO] [stderr]     Checking brotli-decompressor v2.3.1
[INFO] [stderr]     Checking regex v1.4.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking parquet-format v2.6.1
[INFO] [stderr]    Compiling zstd-sys v1.4.17+zstd.1.4.5
[INFO] [stderr]    Compiling lz4-sys v1.9.2
[INFO] [stderr]     Checking brotli v3.3.0
[INFO] [stderr]     Checking num v0.3.0
[INFO] [stderr]     Checking bstr v0.2.14
[INFO] [stderr]     Checking serde_json v1.0.59
[INFO] [stderr]     Checking csv v1.1.3
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]     Checking lz4 v1.23.2
[INFO] [stderr]     Checking arrow v1.0.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/arrow-1.0.1/src/lib.rs:24:1
[INFO] [stdout]    |
[INFO] [stdout] 24 | #![feature(specialization)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `arrow` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "91d43c7b479c581789da8b281eadde5538cade182508c281a13318a47c326725", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91d43c7b479c581789da8b281eadde5538cade182508c281a13318a47c326725", kill_on_drop: false }`
[INFO] [stdout] 91d43c7b479c581789da8b281eadde5538cade182508c281a13318a47c326725
